Xray XB808E pinion gears
Xray have released a complete line of high-performance XB808E pinion gears. Manufactured from special steel for toughness and durability with precise tolerances that assures unparalleled concentricity, they feature precision-cut teeth with chamfered edges. Available in 13T, 14T, 15T, 16T & 17T, they include the M4x4 set screw.
Source: Xray [teamxray.com]